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From: See, Chin Liang <chin.liang.see@intel.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] ARM: socfpga: Assure correct ACTLR configuration
Date: Thu, 31 May 2018 09:52:13 +0000	[thread overview]
Message-ID: <1527846782.3004.4.camel@intel.com> (raw)
In-Reply-To: <20180529163933.29665-1-marex@denx.de>

On Tue, 2018-05-29 at 18:39 +0200, Marek Vasut wrote:
> Make sure the ARM ACTLR register has correct configuration, otherwise
> the Linux kernel refuses to boot. In particular, the "Write Full Line
> of Zeroes" bit must be cleared.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Chin Liang See <chin.liang.see@intel.com>
> Cc: Dinh Nguyen <dinguyen@kernel.org>
> ---
> NOTE: This gem was well hidden in the Altera U-Boot fork and is
> really needed.
>       What is not entirely clear to me is WHY ? So why is this needed
> ?

I vaguely recall it's related to HW constrain. And check back the
downstream U-Boot, actually we need to set the bit instead clearing
it. https://github.com/altera-opensource/u-boot-socfpga/blob/socfpga_v2
014.10_arria10_bringup/arch/arm/cpu/armv7/socfpga_arria10/pl310.c

Thanks
Chin Liang

[...]

  reply	other threads:[~2018-05-31  9:52 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29 16:39 [U-Boot] [PATCH] ARM: socfpga: Assure correct ACTLR configuration Marek Vasut
2018-05-31  9:52 ` See, Chin Liang [this message]
2018-05-31 10:00   ` Marek Vasut
2018-06-06 18:47     ` Marek Vasut
2018-06-23  3:55       ` Marek Vasut
2018-06-23  4:23         ` Marek Vasut
2018-07-03 15:10           ` See, Chin Liang
2018-07-03 16:52             ` Marek Vasut

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